Legal form, e.g. 'Limited Liability Company', 'Nonprofit', 'Corporation'. It is a CONTAINS match on the type name, exactly like the company-name filter: 'corp' finds every corporation type, and a short fragment also matches inside a longer word - 'AB' matches 330,577 Oregon rows because it is inside 'LiABility'. Use a whole word. Colorado and Texas publish codes instead of names: a term that IS one of the codes they publish (DLLC, CL, and also the ones the portals leave undocumented such as CO 'FO' or TX 'AB') matches that code exactly, so the entityType of an exported row always works as input; any other term is matched against the code LABELS and never against the code text, which is why a Colorado 'Limited Partnership' query returns 43,890 rows and not the 58,377 that included DLLP/FLLP limited liability partnerships. Connecticut's own vocabulary is LLC / Stock / Non-Stock / Limited Partnership / LLP - an LLP is not a Limited Partnership and the two terms return different rows. Delaware publishes a licence activity ('GENERAL SERVICES', 'RESIDENT CONTRACTOR'), not a legal form.